Xtank is a fairly old but reliable graphical game requiring multiple players and optimised for
a local area network of X displays. It features fast update rates, assorted mazes, various
vehicles, simple graphics, drone tanks, and team play. Different game styles are possible;
straight combat, territorial expansion, maze races with and without weapons, and ultimate
frisbee. The "north" development branch is James Cameron's modifications to the 1.3f
version for use on 800x600 displays in a network of Linux based second-hand gaming
workstations in a rural village.

"The Game" is a project designed to simplify the
process of producing any high-quality
cross-platform 2D or 3D graphical computer game.
The hope is that any game can be produced simply
by changing a few settings and pressing a
"compile" button. The project has three
"deliverables": a game engine library to abstract
across the set of all possible computer games
(applying object-oriented design methods to the
general problem in such a way as to be usable in
specific instances); a graphical interface for
easy game design (an exercise in human interface
design); and a gaming package with a lot of shiny
games to play.

jIsoEngine is an isometric 2D engine for Java
applications. It provides an SDK of methods
and classes that let developers easily build a
complete game. It is suited for simulation
games, board games, and turn-based games.
The project is bundled with Tourist Camping
Tycoon, a game developed with the engine.

DimensioneX is a multiplayer game engine. It lets
you develop, run, and host browser-based,
graphical multiplayer games. The users will play
games simply via their browser. DimensioneX runs
on any Java-enabled Web server (such as Tomcat).

Galcon Fusion is a high-paced, multi-player, galactic, arcade-strategy game in which you send swarms of ships to defeat enemy planets and conquer the universe. It features beautiful HD graphics, a full-length interactive soundtrack, achievements and detailed rankings, a variety of games including Stealth and Assassin, a retro mode, and colorblind support for up to 4 players. It supports multi-player, team games, and solo missions.

Land Air Sea Warfare is a game where you command gigantic mega units and dominate in battle! Fortify your base with turrets, surface to air missile launchers, torpedo launchers, and long range cannons. Next, create factories to pump out legions of vehicles, aircraft, and ships to wage war with. Execute your strategic battle plan and enjoy the carnage that ensues. Discover unique resources to build gigantic mega units which can turn the tides of war instantly!

MegaGlest is a real-time strategy game for up to eight players with a pseudo historic/fantasy theme and 3D graphics. Modding is easy thanks to simple XML formats and Blender export to the open G3D model format.

Freeciv is a multiuser reimplementation for Unix/X of the famous Microprose game of Civilization. By default, the game is an improved Civ II, but this can be customized; modpacks for near-100% compatibility with Civ I and Civ II are included. Multiuser gameplay is real-time: in each turn, all human players move concurrently. The game is designed to remain fairly playable even on poor network connections. Freeciv can also be played on standalone machines, and its AI players are a good challenge for beginners. The source code comes with the server, two X clients, and non-X clients for MS Windows and Amiga. Freeciv is released under the GNU General Public License. It is maintained by an international team of coders and enthusiasts, and is easily one of the most fun and addictive network games out there.